Tandem Books

Read your book. Listen to it. Switch back and forth without losing your place. Tandem pairs your ebooks with your audiobooks. Start a chapter with your eyes on the train, tap once to continue with your ears on the walk home. Your place follows you between reading and listening. BRING YOUR OWN FILES No bookstore lock-in. Import any DRM-free EPUB ebook and pair it with a matching M4B or MP3 audiobook. Tandem works with files you already own. SWITCH WITHOUT LOSING YOUR PLACE Tap once to switch from reading to listening, or the other way. Tandem uses short audio transcription to line up the ebook and audiobook, then remembers those positions on your device so repeated handoffs in the same area are faster. MADE FOR READING A warm paper surface with a beautiful serif typeface. Adjustable size and spacing. Full-screen immersive mode hides every distraction so you can stay with the book. ONE UNIVERSAL APP Buy once, use it on iPhone, iPad, and Mac. Built natively for Apple platforms using SwiftUI. PRIVACY FIRST No account required. No sign-up. No analytics. Your books live on your device. The only time Tandem ever touches the network is a brief audio transcription when you switch modes — and even that data is never stored. FEATURES • Paired ebook + audiobook in one app • Reading and listening stay aligned as you switch • Warm Paper and Night reading themes • Adjustable text size and line spacing • Per-book reading progress saved automatically • Full keyboard shortcut support on Mac • No account. No subscription. No cloud storage of your books. REQUIREMENTS iOS 26, iPadOS 26, or macOS 26. Bring your own DRM-free EPUB ebooks and M4B or MP3 audiobooks. Kindle, Audible, and other DRM-protected files are not supported.